Problem 49.39 (RHK)
The work function for a metal is 1.85 eV. (a) We have to find the stopping potential for light having a wavelength of 410 nm; (b) the maximum speed of the emitted photoelectrons at the metalís surface.
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Energy of a photon of wavelength 410 nm is
The work function of the metal is 1.85 eV.
Therefore, the stopping potential for the incident light will be
The maximum energy with which photoelectrons will be emitted from the metalís surface will therefore be 1.18 eV.
Therefore, the maximum speed of photoelectrons near the metalís surface will be